Disregarding balance completely (It's perfectly fine IMO)
The cybran ACU is all well and good, however there is an inherent lack of decision making present in it's upgrades.
In most games the cybran ACU has only one real choice; gun or tech two.
Stealth-Cloak/Teleport/RAS:
Stealth is a very nice, very cheap and a complete and utter no brainer as soon as you have the opportunity. It's cost means you are very rarely having to decide between radar stealth and any of the other back upgrades, RAS, cloak, or teleport. While I love the upgrade, and think it fits very will with the faction in general, you are never really having to 'choose' it over another.
Cybran RAS, once again, is very rarely called upon to make a decision with, the other two contenders at that time if the game are Cloak, that cannot be offorded until RAS is almost obsolete, and teleport, that suffers from the same problem.
Now we come to the only other two upgrades that occupy the same timeframe within the game as each other, full stealth, and Teleport. While full stealth can arguably be afforded before teleport, it use is limited to an anti-snipe mechanism. By the time you can afford this both you and your opponent will have the necessary power to make tech three air, and no matter how much health it gives you, you will be unable to use it in order to fight land units, even coupled with a mazer, because as soon as the enemy brings out a single tech three scout or Omni. It could be used in order to minimize the risk of staying in a firebase and attempting to defend it, however, due to cybrans shields, point defense, and artillery, it is simply a waste to have a large firebase at the point in the game when you can of aford this upgrade. In short, this upgrade is simply to useless to occupy a regular game. Don't get me wrong, I love it, but it is simply not worth it.
The only upgrades occupying the cybran ACU late game, are Tekeport and mazer, the timeframe where other upgrades are position'd simply mean's that I am never 'Choosing' anything, other than gun and tech two
Torpedo's/mazer:
Torpedo's are another great an unique upgrade, stuck along the same arm as.... The mazer!? There is simply no situation I can think of that actually calls for a decision to be made between these upgrades. By the time you can afford a mazer, the time for torpedo's is completely over.
I would love to hear people opinions on if they think this is okay, and hypothetically, what they would do to encourage more diversity in the upgrades to the cybran ACU.